Duo ideas

[Wenai]

I just find duos in classic are somewhat limited.

You need:

-Tank
-Heals
-Crowd Control
-DPS (both mana-based and mana-free)
-Ability to single pull

In classic IMO there is no perfect combo. Any efficient duo is probably going to require a pet class in classic. Honestly in classic a ENC+SHM/CLR/DRU is probably going to be the most efficient team that you can find. You will be able to hit all the good named creatures in Guk etc. ENC is a very efficient killer in their own right and adding heals/pet (SHM) or heals/nukes (DRU) to your repertoire is a solid addition.

MAG+CLR is another popular one, but the main problem with that is you really lack slows/true crowd control. A lot of responsibility is pinned on the cleric in this combo as the cleric is not only healing, but also lulling, pulling, rooting, stunning etc. Some clerics thrive on the extra responsibility, others do not.

SHM+MNK is a great option in Kunark. Until Shamans get Torpor their healing ability is pretty well useless. I really think this is one of the biggest mistakes in classic; SHM/DRU being limited to GHeal at level 50 is just dumb. You can pretty much forget about being an efficient healer in classic. Your healing should really only be used in emergency situations.

SHM+NEC is also a very solid duo group. Pulling in dungeons as a necromancer while managing a pet can be difficult, but not impossible. You can easily split 2-spawns using screaming terror+feign death but when it becomes groups of three, with limited space pulling can become a little bit annoying.

Really you can make a lot of things work. Just make sure you have most(all) of your bases covered if you want to do content with two people.